Improvement in burglar-alarms



P. A'BRELL.

BURGLAR-ALARM.

No.174,997. Patented March 21,1876.

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. g i? E K i Mhwsscfi Inventor.

N.PETER8, PHOTD-IJTHOGRAFHER, WASHINGTON. DJ}.

UNITED STATES PATENT OFFICE.

PAUL ABRELL, on NEWARK, NEW JERSEY.

IMPROVEMENT IN BURGLAR-ALARMS.

Specification forming part of Letters Patent No. 174,997, dated March 21, 1876; application filed Marchll, 1876.

To all whom it may concern Be it known that I, PAUL ABRELL, of N ewark, in the State of New Jersey, have invented a new and Improved Alarm for Doors and Window-Shutters, of which the following is a specification The nature of my invention consists in the arrangement of bolts or arms upon or acting against the doors or window-shutters, and connected by suitable levers or rods with an indicator-box, in such a manner that any movement of said doors or shutters will cause the movement of pins in said indicator-box, which act against a rock-shaft, so as to relieve a catch from a suitable clock-work, which sets the alarm in motion. 1

In the accompanying drawing, Figure I represents a front view of the arrangement applied to a door and window-shutter embodying my invention. Fig. II is a side view of the gearing against the door. Fig. III shows a top view of the gearing on the win dow-shutter. Fig. IV is a section of the indicator-box.

Arepresents a door, and B the windowshutters. To the door A a small bracket, 0, is attached. Above this bracket a lever, D, is fixed, the lower end of which is in contact with said bracket 0, and the upper end of which is provided with a projecting pin, a. Against the front of the upper end of this lever D a Hat bar or rod, E, is arranged, capable of sliding in suitable guides, and acted upon by a spring, a. The pin a on the lever D passes through this bar E, and holds the same in position against the action of its spring a. The end of this barE is connected, through a rod, F, with one end of a suitable bell-crank, G. This gearing is described as being arranged at the top of the door; but the same may be arranged on the side, if desired. Through the frame of the window a pin, J, is arranged, capable of sliding in such a manner that the window-shutter B, when closed, will come in contact with the end of said pin, and push or move the same inward.

-The inner end of this pin or bolt J is connected to one end of a bell-crank, L, the other end of which is connected, through the rod N, with the bell-crank G. A spring, m, is arranged, acting against the bell-crank L, so a to force the arm to which the pin or bolt J is attached, and consequently said pin J, outward. The other arm of the bell-crank G is connected to one of the bars 1?, arranged in the indicator-box Q. In the indicator-box Q a number of bolts, R, are arranged, capable of sliding inward and outward, and acted upon by suitable springs w, to push the same outward. These bolts are provided with large heads S on the outside of the box Q, and with beads or projections d on their inner ends, against which the springs to act. The bars P are acted upon by suitable springs c, to hold the same upward in the box, and are provided with openings h, through which the heads or projections 01 on the bolts R can pass whenever the bar P is pulled downward. The heads S act against levers on the rock-shaft U, so as to move a lever or catch, W, clear of a projection or cam, X, on a suitable clockwork, Z, through which the alarm is given.

As soon as the door is opened thebracket G acts against the lever D, so as to move its .pin at out of the bar E, when the spring a pulls said bar E, operating thereby, through the bell-cranks G, the bar P, pulling the same downward, and thereby allowing the bolt R to be pushed out of the box, acting thereby, through therock-shaft U, upon the lever W, to allow the clock-work to operate the alarm. In the same manner the opening of the shutter B will cause the bolt or pin J, on account of the action of the spring m, to move outward, moving thereby, through the bellcrank L, rod N, and crank G, the barP downward, thereby causing the bolt R to move outward, and operate, through the rock-shaft U, the alarm.

The gearing of the door, as well as the gearing of the shutter, are here represented connected to one and the same bar P; but it will readily be understood that they may be attached to separate bars, or the gearing connected with other shutters connected to the same.

The position of the clock-work Z may be likewise changed, and suitable connections by rods and cranks arranged to communicate the desired operation and action of the bars P.

What I claim as my invention, and desire to secure by Letters Patent, is

1. The combination of a bracket, 0, attached to the door, lever D, with projecting pin a, bar E. rod F, hell-crank G, bar P, bolt B, rockshaft U, and lever or catch W, with a suiteble clock-work, Z, operating an alarm-bell, substantially in the manner and for the purpose described.

2. The combination of the shutter B, with bolt or pin J, bell-crank L, provided with spring m, rod N, bell-crank Gr, bar P, holt B, roek'shat't U, and lever W, substantially as described, and for the purpose set forth.

PAUL ABRELL.

Witnesses:

HENRY E. RoEDER, J. B. NoNEs. 

